FLOWMAX - Hot Water Cylinders

1 FLOWMAX . Thermal Storage Cylinder and Combination Units RANGE, new era Works, Mark Street, Wakefield, West Yorkshire WF1 5QZ. Telephone: 01924 376026 Facsimile: 01924 385015. installation instructions To be left with the unit March 2000. 2. DESCRIPTION. FLOWMAX is a vented primary Water thermal storage unit that supplies mains pressure domestic hot Water at good flow rates in accordance with the requirements of BS 6700, NHBC and the British Gas Specification. The FLOWMAX system facilities easy installation without the requirement for Building Control or BBA approval and is readily incorporated into traditional central heating systems.

2 FIG 1. FLOWMAX . Thermal Storage Cylinder and Combination Units CONTENTS. 1. Safety Regulations Page 2. 2. Description Page 3. 3. Specification and Selection Guide Page 5. 4. Water Supply Page 6. 5. System Design Page 7. 6. Installation Procedure Page 8. 7. Electrical Installation Page 10 HOW FLOWMAX WORKS MODEL TYPES. 8. Commissioning Page 11 FLOWMAX differs from the conventional Cylinders in that the Combination Unit (figure 2). Water stored in the FLOWMAX is not the same Water that These units have an integral pre-plumbed primary feed and comes from your taps.

3 It should be thought of as a store of expansion cistern capable of accommodating expansion 9. Fault Finding Page 12. heat. This heat store is typically maintained at 70 80 C from up to 180L of primary Water . It is normally supplied dependant on model. with a float operated valve and warning pipe (overflow). 10. Annual Maintenance Page 13 connection. Combination units eliminate all Water tanks A 50mm thick layer of CFC free foam insulation keeps heat from the roof space. loss to a minimum. Inside every FLOWMAX is a heat exchange coil which uses specially designed finned copper Cylinder Unit (figure 3).

4 Tubing. Mains pressure cold Water is heated instantaneously This unit is often used on retro-fit situations where an as it passes through this coil. existing feed and expansion tank is already present or where there are difficulties an achieving the minimum head Hot Water can leave this coil at over 60 C. A thermostatic requirement recommended by the boiler manufacturer. 1. SAFETY REGULATIONS mixing value (factory set at 55 C but user adjustable). Standard FLOWMAX cylinder units are suitable for a ensures Water is delivered at a safe temperature. The store These instructions should be read in conjunction with those from the boiler manufacturers and other maximum static head of 10m but other models are available.

5 Is vented via a feed and expansion tank. Only the inside of system components. the coil is at mains pressure. FLOWMAX must be installed in accordance with the relevant requirements of the Local Building Regulations, FLOWMAX electric units are heated by two immersion STANDARD BOILER MODELS (figure 4). Building Standards (Scotland) Regulations, Cur rent IEE Wiring regulations, Health and Safety Document 635 heaters and provide hot Water only. Boiler models are The perfect partner for your gas or oil boiler FLOWMAX boiler "The Electricity at Work Regulations 1989, Local Water Bylaws, BS6700 and BS5449.

6 Heated by gas or oil boilers and in addition to hot Water models provide balanced mains pressure hot Water and can also provide heat directly to space heating (typically fast response radiators all form the store. Provision for an radiators). immersion heater gives a back up heat source. When installed in the double pump format the system can be considered as being split into two circuits. In the boiler circuit the store thermostat (typically set at 75 C) controls 2 the boiler to maintain the store at the correct temperature. 3. When the room thermostat calls for heat the space heating pump circulates heat to the radiators.

7 SEVEN PLUS ELECTRIC MODELS. FIG 2 3. SPECIFICATION AND SELECTION GUIDE. The FLOWMAX 7+ Electric model is designed to make the best use of cheap rate electricity from the wide variety of FLOWMAX models cater for applications ranging from the smallest flat to a 4-6 bed, two bathroom property. tariffs available such as Economy 7 or 10. The lower of the Model Capacity Domestic Maximum Typical Typical hot Water two immersion heaters is usually connected to the cheap hot Water recommended house size requirements rate supply and the upper one provides a boost facility for design flowrate radiator load times when you need to reheat the unit but cheap rate (l/min) (kW).

8 Electricity is not available. Electric Models 140 18 Hot Water 1 bed Bath + overbath shower The immersion heaters we supply are manufactured to the 180 20 only 2 beds Bath + overbath shower Maxistore specification. They are a low noise type so as not 210 22 3 beds Bath + Ensuite to disturb anyone when the unit is heating during the night. Boiler Models 140 18 9 kW 2-3 beds Bath + Ensuite Electric units provide hot Water only, space heating is not 180 20 13kW 3-4 beds Bath + Ensuite fed from the store. 210 22 17kW 4-5 beds Upto 2 standard baths SSP Models 140 18 15kW 2-4 beds Bath + Ensuite SEALED SYSTEM PRIMARY (SSP) MODELS.

9 180 20 20kW 3-5 beds Bath + Ensuite As the name suggests these models allow the primary 210 22 25kW 4-6 beds Upto 2 standard baths system to be sealed ( bar max on the standard units). All boiler models meet the British Gas SC2 specification. The sealed system allows the radiators to be positioned FIG 3 The flow restrictor fitted inside the filter / expansion vessel fitting is set at 22l/m. above the FLOWMAX unit. The 210 litre size meets the NHBC requirements for two bathroom properties when one bath is drawn after the other. SSP models are plumbed in like conventional indirect The 210 litre size is recommended when you are connecting to a solid fuel appliance.

10 Cylinders . SSP units provide hot Water only as space heating is supplied directly from the boiler usually via a diverter valve. This has two benefits. Firstly it allows a lower DIMENSIONS: COMBINATION UNITS (mm) DIMENSIONS: CYLINDER UNITS (mm). store temperature (typically 70 C) to be used. Secondly SSP units can be coupled with much larger boilers and space heating loads than with standard FLOWMAX models. Model Height Diameter Model Height Diameter Unlagged Unlagged Usually supplied in the combination tank the top tank Standard Combination Units Standard Cylinder Units keeps the unit topped up as Water is lost by natural evaporation.